Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (1+r)^2*500+700+700r >(1+r)^3*(-8000)+2500+2500r .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 1 + r ) ^ 2 * 500 + 700 + 700 * r > ( 1 + r ) ^ 3 * ( -8000 ) + 2500 + 2500 * r         (1)

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    From inequality(1)：
         -1.50662 < r < -1 或  r ＞ -0.55588

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    The final solution set is :
         -1.50662 < r < -1 或  r ＞ -0.55588

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